CN2449438Y

CN2449438Y - Infrared audio earphone

Info

Publication number: CN2449438Y
Application number: CN 00229288
Authority: CN
Inventors: 戚长海
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-02-22
Filing date: 2000-02-22
Publication date: 2001-09-19
Anticipated expiration: 2010-02-22

Abstract

The utility model relates to an infrared audio earphone for teaching, which is especially suitable for hearing of foreign language. The utility model is composed of a shell body and an internal circuit. The utility model is characterized in that two parts of the shell body are connected with each other by an elastic clamp; one side surface of the shell body is provided with at least one infrared receiving hole, and the inner part of the infrared receiving hole is provided with an infrared receiving tube; the internal circuit is composed of an infrared receiving part, an amplification part, an audio induction receiving part, an infrared audio conversion part, a preamplification part, and a power amplification part. The utility model has the advantages of simple structure, good listening and use effect, and non-interference between earphones. The utility model has the advantages that the utility model makes the infrared and audio frequency integrated, and benefits for teaching.

Description

Infrared audio earphone

The utility model relates to a kind of infrared audio earphone of using in teaching, be particularly suitable for the audio-visual education programme foreign language listening and use.

Development along with educational undertaking, audio-visual education programme is more and more general, but present audio-visual education programme hearing device, particularly the foreign language listening functions of the equipments are single, can not adapt to the quality-oriented education requirement, as existing audio earphone, because the problem on its structure and the electric wave performance, make and face the classroom mutually when using simultaneously separately, serious interference is when the frequency modulation earphone then uses simultaneously with adjacent classroom, voice signal is heard in the phase mutual energy, be difficult to distinguish, influence teaching efficiency greatly, therefore existing audio earphone, frequency modulation earphone do not satisfy the needs of teaching hearing in the development.

The purpose of this utility model provides a kind of novel infrared audio earphone, can solve the problem that interferes with each other when using earphone effectively, to guarantee effects on hearing.

The purpose of this utility model is achieved like this, on the basis of original audio earphone structure, improved, increase the infrared receiver structure, thereby Novel earphone is made of infrared ray and audio frequency two parts, promptly on original earphone case, open infrared receiver hole, infrared receiver tube is housed in it, in circuit, increases the infrared ray receiving unit, circuit is made of infrared reception, amplification, frequency induction reception, infrared audio conversion, preposition amplification and power amplifying part.

It is simple in structure for the utility model, has the advantage that has both kept former audio earphone, has increased infrared reception again and has amplified, and antijamming capability is strong, has enlarged the earpiece application scope, has improved function, more help the raising of quality of instruction.

Below in conjunction with accompanying drawing structure of the present utility model is elaborated.

Fig. 1 is a three-dimensional structure diagram of the present utility model.

Fig. 2 is an internal circuit diagram of the present utility model.

By Fig. 1, Fig. 2 as can be seen, the utility model is to be made of housing and its internal circuit, housing 1 is made up of two parts, fixed body 3 through the rear portion is linked to each other by elastic clip 5, housing 1 front has sound hole 2, has an infrared receiving aperture 4 on housing 1 side at least, and infrared (line) receiving tube N1 is housed in its hole, said internal circuit is to be received and infrared audio conversion, preposition amplification and power amplifying part constitute by infrared reception, amplification, frequency induction, and is contained on the circuit board in the housing 1.

Provide by Fig. 2, said infrared reception, the amplifier section circuit is by infrared receiving tube N1, capacitor C 7, resistance R 8, R9, R10 and triode BG4 constitute, infrared receiving tube N1 can adopt one or many (at least one) parallel connections, two ends are respectively with resistance 10, capacitor C 7 links to each other with common (leading to), the base stage connecting resistance R9 of triode BG4, capacitor C 7, emitter connects common, collector electrode connecting resistance R8 and audio frequency, infrared change over switch S2, resistance R 10 is the biasing resistor of receiving tube N1, resistance R 9, R10, triode BG4 constitutes amplifying circuit, resistance R 9, R10 is the biasing resistor of triode BG4; Frequency induction receives and infrared audio conversion partial circuit is made of induction coil B1, capacitor C 3 and infrared audio conversion switch S 2.The infrared audio conversion switch S 2 of B1 one termination, another termination common, capacitor C 3 one termination S2, the base stage of other end connecting resistance R6 and triode BG3, S2 realizes infrared audio conversion; Resistance R 4, R5, R6, triode BG3 constitute pre-amplification circuit, resistance R 6, R5, R4 are the biasing resistor of BG3, R5 is connected on the emitter of triode BG3, R6, R4 and capacitor C 5 are connected on the collector electrode of triode BG3, variable potentiometer K1 three ends connect capacitor C 5, C4 and common respectively, are used for regulating volume; Power amplification circuit is by resistance R 1, R2, R3, capacitor C 1, C2 and triode BG1, BG2 constitutes, wherein resistance R 1, R2, the R3 biasing resistor, the base stage of power amplification triode BG1 connects collector electrode and the resistance R 1 of power amplification triode BG2, R2, capacitor C 2, the collector electrode connecting resistance R2 of BG1, R4, R7 and power supply VCC, the emitter of BG1 meets capacitor C 1 and loudspeaker S1, the base stage connecting resistance R1 of BG2 and capacitor C 4, C2, emitter connecting resistance R3, be communicated with common again, capacitor C 3, C4, C5, C7 is a blocking condenser, resistance R 7, capacitor C 8 constitutes decoupling circuit, and power supply VCC adopts 3 volts of dry cells.

By said structure as can be seen, the utility model integrates infrared and audio frequency, because of infrared ray not tool wear elegant ability, so listen with exhausted noiseless in adjacent classroom, and can utilize audio earphone to carry out the unified signal of listening to of whole school, both convenient, effective again, expanded the range of application of earphone greatly, make it more perfect function, popularization of the present utility model has remarkable economical and social benefit for using to teaching provides good hearing device.

Claims

1, infrared audio earphone, be to constitute by housing and its internal circuit, housing (1) is made up of two parts, fixed body (3) through the rear portion is linked to each other by elastic clip (5), housing (1) front has sound hole (2), it is characterized in that having an infrared receiver hole (4) at least on housing (1) side, infrared receiving tube N1 is housed in its hole, said internal circuit is to be made of infrared reception, amplification, frequency induction reception and infrared audio conversion, preposition amplification and power amplifying part, and is contained on the interior circuit board of housing (1).

2, infrared audio earphone according to claim 1, it is characterized in that said infrared reception, amplifier section circuit are to be made of infrared receiving tube N1, capacitor C 7, resistance R 8, R9, R10 and triode BG4, at least one two ends of infrared receiving tube N1 link to each other with common with resistance R 10, capacitor C 7 respectively, the base stage connecting resistance R9 of triode BG4, capacitor C 7, emitter connects common, collector electrode connecting resistance R8 and infrared audio conversion switch S 2.

3, infrared audio earphone according to claim 1, it is characterized in that said frequency induction receives and infrared audio conversion partial circuit is made of induction coil B1, capacitor C 3 and infrared audio conversion switch S 2, the infrared audio frequency external conversion of B1 one termination switch S 2, another termination common, capacitor C 3 one termination S2, the base stage of other end connecting resistance R6 and triode BG3.